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  • 1990-1994  (3)
  • 1
    Electronic Resource
    Electronic Resource
    A comparative study of electrochemical reactor configurations for the decomposition of copper cyanide effuent (1992)
    Springer
    Journal of applied electrochemistry 22 (1992), S. 1197-1200 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract An electrochemical reactor packed with stainless steel fibres was used to oxidize a complexed copper cyanide solution. The reactor reduced the cyanide content from over 2000 p.p.m. to less than 100 p.p.m. in 4h. The energy consumption (kWh (kg CN−)−1) for a bipolar setup was larger than for the parallel setup. An analog circuit analysis qualitatively agrees with the experimental results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01297424
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The comparative agronomic effectiveness of rock phosphate and superphosphate for banana (1992)
    Springer
    Nutrient cycling in agroecosystems 31 (1992), S. 131-135 
    Details
    ISSN: 1573-0867
    Keywords: Rock phosphate ; agronomic effectiveness ; banana ; mycorrhiza ; P uptake ; extractable P ; P deficiency symptoms
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The agronomic effectiveness of three rock phosphates (Idaho, Florida and North Carolina) as influenced by mycorrhizal inoculation withGlomus aggregatum was evaluated using small banana (Musa paradisiaca L.) corms as planting material. The treatments included superphosphate and a no-P control. The soil was fumigated to eliminate mycorrhizal propagules. The amount of P added was based on the quantity of material needed as superphosphate to establish 0.2 mg P L−1 in solution. Plants were grown in an Oxisol in 9-liter pots for 3 months after growth commenced. Plant dry weight, P percentage in the 3rd leaf, and total P uptake were increased when plants fertilized with insoluble rock phosphates were inoculated with mycorrhiza-producing fungi. Phosphorus uptake by plants fertilized with Idaho, Florida, and North Carolina rock phosphates was 0.18, 0.42, and 0.97 as much as by plants fertilized with superphosphate. The beneficial effect of mycorrhiza on phosphate uptake was 136, 30, 2 and 24% for plants fertilized with Idaho, Florida and North Carolina rock phosphate, and superphosphate, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01063287
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Swelling of poly(methacrylic acid) gels and adsorption of L-lysine and its polymer on the gels (1991)
    Springer
    Colloid & polymer science 269 (1991), S. 873-879 
    Details
    ISSN: 1435-1536
    Keywords: Adsorption ; L-lysine ; oligo(L-lysine) ; poly(L-lysine) ; poly(methacrylic acid) gel ; swelling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Poly (methacrylic acid) gels (PMAA gels) of various degrees of crosslinking were prepared and the dissociation behavior of these gels was examined; the swelling behavior was investigated as a function of the solution pH values. A reentrant phenomenon of swelling was observed and interpreted based on the Flory-Huggins equation and the Donnan equilibrium formula. Moreover, adsorption of L-lysine, oligo(L-lysine)s (Lys-n,n=3, 9, and 19) and poly(L-lysine) onto PMAA gels from aqueous solutions was investigated under different conditions of pH and concentration of adsorbate. The adsorption ratio of L-lysine onto PMAA gel is dependent on both the pH of solution and the degree of crosslinking. In a pH range between 8 and 9, the protonated form of L-lysine is strongly adsorbed on the PMAA gel by electrostatic interactions. Oligomers and polymer of L-lysine are adsorbed in a somewhat different way from the monomeric L-lysine. In addition, the desorption behavior of L-lysine from PMAA gels by a change in pH was also investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00657303
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    Paper (German National Licenses)
    Fulltext
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